;******************************************************************************
;
; (C) Copyright MICROSOFT Corp., 1988-1990
;
; Title: VMDAEGA.INC
;
; Version: 1.00
;
; Date: 15-Feb-1989
;
; Author: AR, MDW
;
;------------------------------------------------------------------------------
;
; Change log:
;
; DATE REV DESCRIPTION
; ----------- --- -----------------------------------------------------------
; 24-APR-1989 MDW CGA version branched from EGA version
;==============================================================================
;VDD virtual mode services for the grabber
GRB_Get_Version EQU 0
GRB_Get_Mem EQU GRB_Get_Version + 1
GRB_Get_State EQU GRB_Get_Mem + 1
GRB_Get_Mod EQU GRB_Get_State + 1
GRB_Clear_Mod EQU GRB_Get_Mod + 1
GRB_Free_Mem EQU GRB_Clear_Mod + 1
GRB_Get_GrbMem EQU GRB_Free_Mem + 1
GRB_Free_Grab EQU GRB_Get_GrbMem + 1
GRB_Get_GrbState EQU GRB_Free_Grab + 1
GRB_Unlock_APP EQU GRB_Get_GrbState + 1
IFDEF DEBUG
Grabber_VerNum EQU 03FFh ; version 3, -1
ELSE
Grabber_VerNum EQU 0300h ; version 3, -1
ENDIF
;*******************
; Controller state structure
;
; CGA, type = 0
;
VDA_CGA_State STRUC
VDA_CGA_Type db ? ; Display emulation type(CGA=0)
VDA_CGA_Flags db ? ; Flags
VDA_CGA_Mode db ? ; Display mode(0-A)
VDA_CGA_Colr db ? ; Color select/Palette
VDA_CGA_CurX dw ? ; Cursor horizontal position
VDA_CGA_CurY dw ? ; Cursor vertical position
VDA_CGA_CurBeg dw ? ; Cursor start scan line
VDA_CGA_CurEnd dw ? ; Cursor end scan line
VDA_CGA_Rows db ? ; Height of display in lines (text mode)
VDA_CGA_CharHgt db ? ; Character height(-1) in scan lines
VDA_CGA_State ENDS
;*******
;
; Controller modes
;
;Name...............Value.......Resol'n...color.....Adap....Pages
;----------------------------------------------------------------
VMode40x25BW16 EQU 0 ; 40x25 16 grey CGA/EGA 8/8
VMode40x25Co16 EQU 1 ; 40x25 16 color CGA/EGA 8/8
VMode80x25BW16 EQU 2 ; 80x25 16 grey CGA/EGA 4/8
VMode80x25Co16 EQU 3 ; 80x25 16 color CGA/EGA 4/8
VModeLoResCo4 EQU 4 ; 320x200 4/8 color CGA/EGA 1/1
VModeLoResBW4 EQU 5 ; 320x200 4/8 grey CGA/EGA 1/1
VModeMdResBW2 EQU 6 ; 640x200 2 BW CGA/EGA 1/1
VModeMono EQU 7 ; 80x25 4 mono Mono/EGA 4/8
; or16/64(mem)
;
; Controller flags
;
fVDA_V_ScOff EQU 0001h ; Screen off
fVDA_V_ScOffBit EQU 0
fVDA_V_HCurTrk EQU 0002h ; Horizontal cursor track - keep
fVDA_V_HCurTrkBit EQU 1 ; cursor position in window
BeginDoc
;***************
; EGA/VGA VDD modifications state structure ::= <flag>,<count>,<list>
;
; <flag> indicates type, list valid and controller change and cursor change.
; <count> is count of entries(not bytes or words) in list.
; <list> is type dependent as follows:
; Type 0 - list is modified pages bit map, 1 bit per displayed 4k page,
; count is page count. Bit map is one byte per 32k linear address
; space, where byte 0's bits are <page 0 bit>,<page 1 bit>,
; ...,<page 7 bit>. byte 1's bits are <page 8 bit>,<page 9 bit>.
; A set bit indicates a change in that page.
;
; This type is not used for text modes.
;
; Type 1 - modified enclosing rectangles, count is rectangle count,
; (less than four) , rectangle is two points: <left>,<top> and
; <right>,<bottom>. Each point is relative to left, upper
; corner which is 0,0 and each value is stored in one word.
;
; This type may be used for all modes.
;
; For text modes, modes 0-3, there may be a special, scroll rectangle.
; If the high bit of R_Left is set in one of these RECTs, then it is
; not a rect but a scroll specification.
; The structure then becomes: <scroll count>,<scroll flags>,
; <right column>,<left column>,<bottom line>,<top line>,
; <fill character>,<fill attribute>
; Note that all items are byte values and that the scroll event
; specification takes the same space as an update rectangle.
;
ModListMax EQU 64 ; Max size of VDD_Mod_List field
EndDoc
VDD_Mod_State STRUC
VDD_Mod_Flag DW ? ; Modified state flag
VDD_Mod_Count DW ? ; Count of entries in modification list
VDD_Mod_List DB ModListMax dup(?) ; The modification list(type dependent)
VDD_Mod_State ENDS
;
; Masks and bit numbers for VDD_Mod_Flag
;
fVDD_M_Type EQU 0000000000000111B ; Mask for value field
fVDD_M_TypeBit EQU 0 ; start bit for value field
fVDD_M_Ctlr EQU 0000000000001000B ; flag indicating controller state chg
fVDD_M_CtlrBit EQU 3 ; bit for controller state change
fVDD_M_VRAM EQU 0000000000010000B ; flag indicating Video RAM change
fVDD_M_VRAMBit EQU 4 ; bit for Video RAM change
fVDD_M_Curs EQU 0000000000100000B ; flag indicating Cursor change
fVDD_M_CursBit EQU 5 ; bit for Cursor change
fVDD_M_ScOff EQU 0000000001000000B ; flag indicating screen is off
fVDD_M_ScOffBit EQU 6 ; bit for screen off
fVDD_M_Err EQU 1000000000000000B ; flag indicating error, can't pass mods
fVDD_M_ErrBit EQU 15 ; bit for error
;
; Values for fVDD_M_TypeMsk field
;
fVDD_M_Type_Page EQU 0 ; Bit field of modified pages
fVDD_M_Type_Rect EQU 1 ; Array of RECT structures
; Structure for accessing RECTs
Rect STRUC
R_Left DW ?
R_Top DW ?
R_Right DW ?
R_Botm DW ?
Rect ENDS
;********
; If the high bit of R_Left is set in one of these RECTs, then it is
; not a rect but a scroll event specification.
; THIS APPLIES TO TEXT MODE ONLY (modes 0-3)!!
; A scroll event spec looks like this:
;
ScrollRect STRUC
ScrCnt DB ? ; Count of lines to scroll in scroll region
ScrFlgs DB ? ; Flags
ScrRgt DB ? ; Right Col of scroll (0 indexed)(ignore if full width bit set)
ScrLft DB ? ; Left Col of scroll (0 indexed)(ignore if full width bit set)
ScrBot DB ? ; Bottom line of scroll (0 indexed)
ScrTop DB ? ; Top line of scroll (0 indexed)
ScrFch DB ? ; Fill character for blank lines of scroll
ScrFatt DB ? ; Fill attribute for blank lines of scroll
ScrollRect ENDS
; Masks for ScrFlgs
Scr_M_Scroll EQU 10000000B ; High bit of flags indicates scroll
Scr_M_ScrollBit EQU 7
Scr_M_FullWid EQU 00000001B ; Set if scroll is full width (ignore Rgt Lft)
Scr_M_FullWidBit EQU 0
Scr_M_Up EQU 00000010B ; Set if scroll is UP, clear if DOWN
Scr_M_UpBit EQU 1
IF2
IF (SIZE ScrollRect) NE (SIZE Rect)
%out ERROR -- ScrollRect is wrong size!!!!!
ENDIF
ENDIF
;*******************
; Memory state structure
;
VDA_Mem_State STRUC
VDA_Mem_Addr DD ? ; Address of memory in video mem handle
VDA_Mem_PgMap DB 8 DUP (?) ; Page map 32k
VDA_Mem_DPagOff DD ? ; 32 bit offset from page start
VDA_Mem_DispPag DB ? ; Page number of start of display
VDA_Mem_Resvd DB ?, ?, ? ; Reserved
VDA_Mem_State ENDS
;
; ADDRESSING VIDEO DISPLAY
;
; Start of the display memory = VDA_Mem_Addr + VDA_Mem_DPagOffset +
; (1000h * VDA_Mem_PgMap[VDA_Mem_DspPag + (8 * <plane>)])
;
; For modes 0-6, the <plane> is always 0
;
; Displayed memory within a plane is always contiguous from the start
; address as computed according to the formula above and the macro below.
; Addressing the display memory from the computed start is as follows,
; where X is 0 based column and Y is 0 based row.
;
; Mode 0-1: Even byte is char, odd byte is attr, 40 cols, 25 rows
; one plane.
; ChrByteOff=(X/2)+(Y*80); AttrByteOff=ChrByteOff+1
;
; Mode 2-3,7: Even byte is char, odd byte is attr, 80 cols, 25 rows,
; one plane.
; ChrByteOff=(X/2)+(Y*160); AttrByteOff=ChrByteOff+1
;
; Mode 4-5: 2 bits per PEL, packed into bytes: bits 7-6 is PEL 0,
; bits 5-4 is PEL 1, etc. Where PEL = X MOD 4. Odd rows
; offset by 8k from even rows. 320 cols, 200 rows, one plane.
; PELByteOff=(X/4)+((Y/2)*80)+((Y MOD 2)*8192)
;
; Mode 6: 1 bit per PEL, packed into bytes: bit 7 is PEL 0,
; bit 6 is PEL 1, bit 5 is PEL 2, etc., where PEL = X MOD 8.
; Odd rows offset by 8k from even rows. 640 cols, 200 rows,
; one plane.
; PELByteOff=(X/8)+((Y/2)*160)+((Y MOD 2)*8192)
;
;
; DestReg = 32 bit register to place video memory address
; MemStateReg = 32 bit register which -> VDA_Mem_State
; MemStateSeg = SEGMENT REGISTER for MemStateReg
; PlaneReg = 32 bit register holding plane number desired
;
; ALL REGISTERS MUST BE SEPARATE!!!!!
;
;
GetStartDispAddr MACRO DestReg,MemStateReg,PlaneReg,MemStateSeg
movzx DestReg,MemStateSeg:[MemStateReg.VDA_Mem_DispPag]
lea DestReg,[DestReg][PlaneReg*8]
movzx DestReg,MemStateSeg:[MemStateReg.VDA_Mem_PgMap][DestReg]
shl DestReg,12
add DestReg,MemStateSeg:[MemStateReg.VDA_Mem_Addr]
add DestReg,MemStateSeg:[MemStateReg.VDA_Mem_DPagOff]
ENDM
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